I have an 86 Honda civic SI. It has lost it's spark. I replaced the ignition module and no help. When you turn on the key it sparks once but not again. I have looked at the coil in the distributor. It has continuity to the coil and about 640 ohms resistance in the coil section of the unit. Is this reading ok or not. I am looking to pull the four bladed piece that moves past the magnets and am wondering if I can use a puller to get it off the shaft so I can replace the coil if necessary and reassemble the distributor.